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WO1999023765A2 - Procede et systeme pour la radiocommunication entre un dispositif radio fixe et un dispositif radio mobile - Google Patents

Procede et systeme pour la radiocommunication entre un dispositif radio fixe et un dispositif radio mobile Download PDF

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Publication number
WO1999023765A2
WO1999023765A2 PCT/EP1998/007203 EP9807203W WO9923765A2 WO 1999023765 A2 WO1999023765 A2 WO 1999023765A2 EP 9807203 W EP9807203 W EP 9807203W WO 9923765 A2 WO9923765 A2 WO 9923765A2
Authority
WO
WIPO (PCT)
Prior art keywords
radio
radio device
registration
registered
base
Prior art date
Application number
PCT/EP1998/007203
Other languages
German (de)
English (en)
Other versions
WO1999023765A3 (fr
Inventor
Edgar Kühn
Ulrich Barth
Christoph Sperber
Original Assignee
Alcatel
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Alcatel filed Critical Alcatel
Publication of WO1999023765A2 publication Critical patent/WO1999023765A2/fr
Publication of WO1999023765A3 publication Critical patent/WO1999023765A3/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W60/00—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
    • H04W60/04—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration using triggered events
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/713—Spread spectrum techniques using frequency hopping
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/12—Detection or prevention of fraud
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/12—Detection or prevention of fraud
    • H04W12/121—Wireless intrusion detection systems [WIDS]; Wireless intrusion prevention systems [WIPS]
    • H04W12/122—Counter-measures against attacks; Protection against rogue devices

Definitions

  • the invention relates to a method for establishing a wireless radio connection between a fixed base radio device and at least one, in particular mobile, radio device that can be registered on the base radio device, both of which exchange radio signals with one another during the initial connection (registration) according to a predetermined registration protocol, and a corresponding radio communication system.
  • GSM Global System for Mobile Communications
  • frequency hopping is used in GSM for the transmission of radio signals on a transmission channel.
  • the frequency hopping method the transmission frequency used by the respective transmission channel is changed at certain time intervals. Since a piece of information to be transmitted is transmitted in a plurality of radio signals, each of which is transmitted successively at time intervals, frequency hopping is used to transmit the information to be transmitted distributed over different frequencies. This ensures that even if one of the transmission frequencies is disturbed, the information is transmitted without interference on another transmission frequency.
  • Frequency hopping can reduce transmission interference that occurs due to the geographic topology (e.g. fading), as well as the probability of interference of a base radio device with an adjacent base radio device, which also uses one of the transmission frequencies of the other base radio device.
  • frequency hopping for the transmission frequencies assigned to a cell is restricted insofar as that for certain common transmission channels required for providing the radio connection, in particular FCCH (Frequency Correction CHannel), SCH (Synchronization CHannel), on which basic and signaling data are transmitted, must use one or more fixed transmission frequencies.
  • FCCH Frequency Correction CHannel
  • SCH Synchronization CHannel
  • beacon Digital European Cordless Telecommunication
  • a so-called "beacon” signal is continuously transmitted on a transmission channel at a certain frequency, even if no connection is established. If this beacon signal is detected by a mobile radio device, a corresponding response signal (set-up request) is sent on the same frequency. This means that a specific registration procedure also runs here on a fixed frequency.
  • the invention is therefore based on the object of developing a method of the type mentioned at the outset such that a registration attempt is recognized and terminated as early as possible in the case of radio devices which are not authorized to register with a basic radio device.
  • a radio communication system suitable for carrying out this method is to be created.
  • This object is achieved according to the invention in that the base radio device and each radio device that can be registered on it changes the radio frequency used for the transmission in a respectively predetermined sequence (step sequence) during the registration.
  • a basic radio device in particular a CTS (Cordless Telephone System), and all mobile radio devices (Modified Mobile Station, MMS for short) authorized by it (i.e. authorized for registration) have a common start frequency sequence.
  • Frequency hopping is used from the beginning of the registration procedure until the switch to the current hopping sequence of the CTS can take place.
  • an early selection of closely adjacent CTS-FPs with possibly the same starting frequency but then different further frequency hopping sequences should be achieved in a CTS-FP network. The latter is primarily for time-critical procedures, such as very important for handover (MMS initiated handover).
  • TDMA Time Division Multiple Access
  • PLMN Public Land Mobile Network
  • a radio device to be registered at the base radio station starts the registration with the base radio device by sending a start signal of a predetermined start frequency.
  • FCCH or beacon signals BCCH
  • the registration on a base radio device takes place completely independently of other base radio devices, since the Mobile radio device MMS to be registered activates the base radio device CTS-FP to start the registration procedure by sending a frequency correction burst FB. If no MMS is registered yet, the CTS-FP can temporarily stop sending (sleep mode), which prevents interference.
  • At least one of a plurality of transmission channels of the base radio device is used solely for the registration of all registerable radio devices.
  • the common start frequency sequence ie the registration procedure for all radio devices that can be registered on the base radio device, then runs in this at least one transmission channel.
  • each registered radio device for the radio transmission following the registration with the base radio station, is permanently assigned a separate transmission time range (transmission channel) in a periodic transmission frame, or at least for the duration of a message transmission, and is assigned with the exception of at least one
  • the same transmission frequency is used within a time frame only for the transmission channel used for registration, which changes for successive time frames according to a defined algorithm.
  • the parameters necessary for the congruent takeover or for the latching (synchronization) in the currently running "hopping sequence" of the CTS-FP are sent from the CTS-FP to the MMS to be registered.
  • the invention also relates to a radio communication system for carrying out the method described above with a, in particular stationary, base radio device and at least one, in particular mobile, radio device which can be registered on the base radio device and which has a common starting frequency sequence for all on the base radio device registrable mobile base radio devices is marked.
  • the same start frequency sequence i.e. the same starting frequency and the same subsequent frequency hopping sequence is the "common secret" of a CTS-FP and all MMSs that are allowed to register with this CTS-FP.
  • the start frequency sequence is described in an initialization procedure together with other parameters such as those for frequency hopping, stored in the CTS-FP and in the MMSs assigned to this CTS-FP (e.g. in an EEPROM). If an MMS can register with several CTS-FPs (roaming or handover, in particular operation in an "external" CTS or an "external” CTS network), a data record is required for each CTS-FP.
  • the CTS-FP can still register at least one MMS, it monitors the radio channel of the stored start frequency at specific times (time slots) within a TDMA frame.
  • An MMS starts a registration attempt by sending a burst (eg an FCCH burst) on this frequency. Is this from the CTS received, it starts the registration procedure according to a registration protocol. For each subsequent TDMA frame, the next channel frequency of the specified start frequency sequence is used independently of one another by the CTS-FP and the MMS.
  • the synchronization of the MMS to the CTS in frequency and time the transfer of the parameters necessary for latching (synchronization) into the currently running "hopping sequence" of the CTS-FP, and possibly other procedures for authentication and control of Encryption done.
  • the parameters necessary for "latching" into the currently running "hopping sequence” can be, for example, the parameters required for the original GSM frequency hopping algorithm or special register values for alternative frequency hopping algorithms.
  • GSM Global System for Mobile Communications
  • TETRA Trans European Trunked Radio Access

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé pour établir une liaison radio sans fil entre un dispositif radio de base, notamment fixe, et au moins un dispositif radio, notamment mobile, pouvant être enregistré sur le dispositif radio de base. Ces deux dispositifs peuvent échanger des signaux radio, selon un protocole d'enregistrement prédéterminé, pendant l'enregistrement initial de la liaison (enregistrement). Le dispositif radio de base et chaque dispositif radio pouvant être enregistré sur celui-ci modifient la fréquence radio utilisée pour la transmission dans une séquence respective préalablement déterminée (séquence de saut), pendant l'enregistrement. Ainsi, une tentative d'enregistrement peut être détectée et stoppée le plus tôt possible dans le cas de dispositifs radio non habilités à s'enregistrer sur un dispositif radio de base.
PCT/EP1998/007203 1997-10-31 1998-10-28 Procede et systeme pour la radiocommunication entre un dispositif radio fixe et un dispositif radio mobile WO1999023765A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19748057A DE19748057A1 (de) 1997-10-31 1997-10-31 Verfahren und System zur Funkkommunikation zwischen einer ortsfesten und einer mobilen Funkvorrichtung
DE19748057.8 1997-10-31

Publications (2)

Publication Number Publication Date
WO1999023765A2 true WO1999023765A2 (fr) 1999-05-14
WO1999023765A3 WO1999023765A3 (fr) 1999-07-08

Family

ID=7847166

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1998/007203 WO1999023765A2 (fr) 1997-10-31 1998-10-28 Procede et systeme pour la radiocommunication entre un dispositif radio fixe et un dispositif radio mobile

Country Status (2)

Country Link
DE (1) DE19748057A1 (fr)
WO (1) WO1999023765A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7466983B2 (en) 2000-09-01 2008-12-16 Telefonaktiebolaget L M Ericsson (Publ) Overload protection in packet communication networks

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4807248A (en) * 1984-05-23 1989-02-21 Rockwell International Corporation Automatic resynchronization technique
US4887265A (en) * 1988-03-18 1989-12-12 Motorola, Inc. Packet-switched cellular telephone system
US5079768A (en) * 1990-03-23 1992-01-07 Metricom, Inc. Method for frequency sharing in frequency hopping communications network
US5177765A (en) * 1991-06-03 1993-01-05 Spectralink Corporation Direct-sequence spread-spectrum digital signal acquisition and tracking system and method therefor
US5123029A (en) * 1991-06-21 1992-06-16 International Business Machines Corporation Broadcast-initiated bipartite frame multi-access protocol
US5210771A (en) * 1991-08-01 1993-05-11 Motorola, Inc. Multiple user spread-spectrum communication system
FI94202C (fi) * 1991-11-11 1995-07-25 Nokia Telecommunications Oy Radiokanavien allokointimenetelmä
AU670955B2 (en) * 1992-08-04 1996-08-08 Koninklijke Philips Electronics N.V. Mobile radio system
US5381443A (en) * 1992-10-02 1995-01-10 Motorola Inc. Method and apparatus for frequency hopping a signalling channel in a communication system
US5627880A (en) * 1992-11-02 1997-05-06 Motorola, Inc. MAHO method for SFH-CDMA/TDMA using punctured frames
US5506863A (en) * 1993-08-25 1996-04-09 Motorola, Inc. Method and apparatus for operating with a hopping control channel in a communication system
US5537434A (en) * 1993-10-25 1996-07-16 Telefonaktiebolaget Lm Ericsson Frequency hopping control channel in a radio communication system
DE4342213C1 (de) * 1993-12-10 1997-01-30 Ant Nachrichtentech Verfahren zum Aufbau von Verbindungen zwischen Erdfunkstellen
JP3284074B2 (ja) * 1996-03-25 2002-05-20 キヤノン株式会社 無線通信システム及びその制御方法、無線通信装置及びその制御方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7466983B2 (en) 2000-09-01 2008-12-16 Telefonaktiebolaget L M Ericsson (Publ) Overload protection in packet communication networks

Also Published As

Publication number Publication date
DE19748057A1 (de) 1999-05-06
WO1999023765A3 (fr) 1999-07-08

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